Add unit tests for authentication and webhook parsing

- Implement tests for basic and bearer authentication headers in `test_auth.py`.
- Create tests for the `EasybillWebhookParser` in `test_webhooks.py`, covering JSON and form-encoded payloads, as well as a generic parse and acknowledgement method.

generated/sync/docs/Project.md

@@ -0,0 +1,41 @@
+# Project
+
+
+## Properties
+
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**budget_amount** | **int** | Project budget in cents (e.g. \"150\" = 1.50€) | [optional] 
+**budget_time** | **int** | Time budget in minutes (e.g. \"90\" = 1 hour and 30 minutes) | [optional] 
+**customer_id** | **int** |  | [optional] 
+**hourly_rate** | **float** | Hourly rate in cents (e.g. \"150\" = 1.50€) | [optional] 
+**id** | **int** |  | [optional] [readonly] 
+**login_id** | **int** | If omitted or null, the currently active login is used | [optional] 
+**name** | **str** |  | 
+**note** | **str** |  | [optional] [default to 'null']
+**status** | **str** |  | [optional] [default to 'OPEN']
+**due_at** | **date** |  | [optional] 
+**budget_notify_frequency** | **str** |  | [optional] [default to 'ALWAYS']
+**consumed_time** | **int** |  | [optional] [readonly] 
+**consumed_amount** | **int** |  | [optional] [readonly] 
+
+## Example
+
+```python
+from easybill_generated_sync.models.project import Project
+
+# TODO update the JSON string below
+json = "{}"
+# create an instance of Project from a JSON string
+project_instance = Project.from_json(json)
+# print the JSON string representation of the object
+print(Project.to_json())
+
+# convert the object into a dict
+project_dict = project_instance.to_dict()
+# create an instance of Project from a dict
+project_from_dict = Project.from_dict(project_dict)
+```
+[[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
+
+